Added some nicer styling for text content pages.

# Changes
- Added some nicer styling for text content pages.

# Screenshot
![screen shot 2014-11-13 at 11 37 05 am](https://cloud.githubusercontent.com/assets/583202/5032183/dab677fe-6b29-11e4-973e-4a106600444f.png)
Yeah. I like it because it helps me make sure I'm not accidentally adding a new hex code somewhere. This should actually probably be `$base-background-color` instead – which just aliases to `$black` in `variables.css`... hmm.